<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <el-alert title="注意！只允许为第三级分类设置相关参数" type="warning" :closable="false" show-icon></el-alert>
      <!-- 选择商品分类区 -->
      <el-row class="cat_option">
        <el-col>
          <span>选择商品分类：</span>
          <el-cascader v-model="selectedKeys" :options="cateList" :props="cateProps" @change="handelChange"></el-cascader>
        </el-col>
      </el-row>

      <!-- tab页签区 -->
      <el-tabs v-model="activeName" @tab-click="handleClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item, id) in scope.row.attr_vals" closable :key="id" @close="handleClose(id, scope.row)">{{item}}</el-tag>
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
                        <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item, id) in scope.row.attr_vals" closable :key="id" @close="handleClose(id, scope.row)">{{item}}</el-tag>
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加属性或参数的对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClose">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <!-- prop便于验证规则指定验证哪个属性 -->
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改属性或参数的对话框 -->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClose">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <!-- prop便于验证规则指定验证哪个属性 -->
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      cateList: [],
      selectedKeys: [],
      cateProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      activeName: 'many',
      manyTableData: [],
      onlyTableData: [],
      addDialogVisible: false,
      addForm: {
        attr_name: ''
      },
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      editDialogVisible: false,
      editForm: {
        attr_name: ''
      },
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      }
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取失败')
      }
      this.cateList = res.data
      console.log(this.cateList)
    },
    handelChange() {
      this.getParamsData()
    },
    handleClick() {
      console.log(this.activeName)
      this.getParamsData()
    },
    async getParamsData() {
      if (this.selectedKeys.length !== 3) {
        this.selectedKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        this.activeName = 'many'
      } else {
        // console.log(this.selectedKeys)
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: {
            sel: this.activeName
          }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取失败')
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
          // 控制每一项文本框的显示与隐藏
          item.inputVisible = false
          // 每一项文本框的内容
          item.inputValue = ''
        })
        // console.log(res.data)
        if (this.activeName === 'many') {
          this.manyTableData = res.data
        } else {
          this.onlyTableData = res.data
        }
      }
    },
    addDialogClose() {
      this.$refs.addFormRef.resetFields()
    },
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (valid) {
          const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          })
          if (res.meta.status !== 201) {
            return this.$message.error('添加失败')
          }
          this.$message.success('添加成功')
          this.getParamsData()
          this.addDialogVisible = false
        }
      })
    },
    editDialogClose() {
      this.$refs.editFormRef.resetFields()
    },
    async showEditDialog(attrId) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`, {
        attr_sel: this.activeName
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取失败')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (valid) {
          const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
            attr_sel: this.activeName,
            attr_name: this.editForm.attr_name
          })
          if (res.meta.status !== 200) {
            return this.$message.error('修改失败')
          }
          this.$message.success('修改成功')
          this.getParamsData()
          this.editDialogVisible = false
        }
      })
    },
    async removeParams(attrid) {
      const confirmRes = await this.$confirm('此操作将永久删除参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmRes !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrid}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除失败')
      }
      this.$message.success('删除成功')
      this.getParamsData()
    },
    handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
      } else {
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        this.saveAttrVal(row)
      }
      row.inputVisible = false
    },
    showInput(row) {
      row.inputVisible = true
      // $nextTick作用就是当页面上的元素被重新渲染后，才会执行回调函数
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    async saveAttrVal(row) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_sel: row.attr_sel,
        attr_name: row.attr_name,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败')
      }
      this.$message.success('修改参数项成功')
    },
    handleClose(id, row) {
      row.attr_vals.splice(id, 1)
      this.saveAttrVal(row)
    }
  },
  computed: {
    // 按钮是否禁用的计算属性，若返回true则禁用
    isBtnDisabled() {
      if (this.selectedKeys.length !== 3) {
        return true
      }
      return false
    },
    cateId() {
      if (this.selectedKeys.length === 3) {
        return this.selectedKeys[2]
      }
      return null
    },
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style scoped>
  .cat_option{
    margin: 15px 0;
  }
  .el-tag{
    margin: 10px;
  }
  .input-new-tag{
    width: 120px;
  }
</style>
